Digestibility, intake behavior, and performance of sheep fed residues from fruit processing agro-industries

ABSTRAT The objective was to evaluate the consumption, digestibility and performance of the sheep with iso protein diets, with 75% of residues from fruit agro-industries (pineapple, acerola, passion fruit, and cupuassu) and a diet with tifton hay, and 25% of concentrate, in a totally randomized design. The participation of passion fruit residue on the diet provided the highest consumption levels of dry matter (1170.6g d -1 ) compared with the residues of pineapple (693.8g d -1 ), acerola (644.2g d -1 ), cupuassu (452.9g d -1 ) and tifton hay (962.7g d -1 ), which is related to their levels of digestibility (77.85, 63.14, 59.07, 61.68 and 71.83%, respectively). Such a result generated significant differences with emphasis on passion fruit residue regarding food inversion (8.30) and average daily weight gain (141.50g d -1 ), in spite of having the same conversion detected for tifton hay (13.2), it showed a higher average daily gain (75.6g d -1 ). The other residues showed overlapping effects, however, acerola residue showed the worst conversion level (51.4) and the lowest average daily gain (15.6g d -1 ), and this one showed no difference compared with cupuassu (23.0g d -1 ). The residues can be used as an alternative for sheep feeding.摘要：本试验旨在评估饲喂等蛋白质日粮（iso protein diets）的绵羊的采食量、消化率与生产性能。试验设置两类日粮：一类日粮包含75%的水果农工业副产物（fruit agro-industries residues，涵盖菠萝（pineapple）、针叶樱桃（acerola）、西番莲（passion fruit）及库普阿苏果（cupuassu）），另一类日粮以75%提夫顿干草（Tifton hay）搭配25%精料（concentrate），试验采用完全随机设计（totally randomized design）。与菠萝副产物组（693.8g·d⁻¹）、针叶樱桃副产物组（644.2g·d⁻¹）、库普阿苏果副产物组（452.9g·d⁻¹）及提夫顿干草组（962.7g·d⁻¹）相比，西番莲副产物组的干物质（dry matter）采食量最高，达1170.6g·d⁻¹，该结果与其消化率（digestibility）水平直接相关，各组干物质消化率分别为77.85%、63.14%、59.07%、61.68%及71.83%。上述结果带来显著组间差异，其中西番莲副产物组的饲料转化率（food inversion）为8.30，平均日增重（average daily weight gain）达141.50g·d⁻¹；尽管提夫顿干草组的饲料转化率为13.2，但其平均日增重仅为75.6g·d⁻¹，显著低于西番莲副产物组。其余副产物组的生产性能指标无显著差异，但针叶樱桃副产物组的饲料转化率最差（51.4），平均日增重最低（15.6g·d⁻¹），且与库普阿苏果副产物组（23.0g·d⁻¹）无统计学差异。上述水果农工业副产物可作为绵羊饲喂的替代饲料来源。